They lie unsupported in the subarachnoid space. The early precursors of aneurysms are small outpouchings through defects in the media of the arteries. These defects expand as a result of hydrostatic ...

The reported incidence of aneurysmal subarachnoid hemorrhage varies widely across the world, from 2.0 cases per 100,000 persons in China to 22.5 cases per 100,000 persons in Finland 11; variation ...

There remains CSF flow obstruction and pathological change to the subarachnoid space, such as arachnoid adhesion or scarring, at the lesion site, either of which is the cause of the syringomyelia ...